<i>In situ</i> structural evolution of a nickel boride catalyst: synergistic geometric and electronic optimization for the oxygen evolution reaction

Li, Jihong; Chen, Hui; Liu, Yipu; Gao, Ruiqin; Zou, Xiaoxin

doi:10.1039/c9ta00489k

Cited by 84 publications

(64 citation statements)

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“…Later, our group realized the feasible growth of Ni 3 B layers on nickel sheets by improving the boronization process. 45 The excess boron powder was found can be reusable in the cyclic synthesis procedure for obtaining boronized Ni plates (Fig. 8b).…”

Section: Element Reaction Routementioning

confidence: 94%

“…For example, the position of the metal d-band center in RuB 2 is close to that of the benchmark Pt catalyst, leading to optimal hydrogen adsorption and Pt-like activity for the HER. 43 When employed as OER catalysts, borides often undergo surface reconstruction to form boron-containing amorphous oxide layers, 44,45 in which the catalytically active phase remains poorly understood. Thus, the essential connection between the electronic structure of borides and OER performance is currently not well established.…”

Section: Electronic and Bonding Propertiesmentioning

confidence: 99%

“…[126][127][128][129] Transition metal borides as a class of non-oxide OER electrocatalysts received much attention in recent years. Particularly some metal-rich borides exhibited promising OER activity, mainly including cobalt borides (e.g., Co 2 B, Co 3 B), 130,131 iron borides (e.g., Fe 2 B), 132 nickel borides (e.g., Ni 2 B, Ni 3 B), 45,133 and their solid solutions (e.g., Ni x Fe 2−x B). 134 For example, our group performed a boronizing treatment on diverse metal sheets (including Fe, Co, Ni, NiFe alloys and steel sheets) to produce M 2 B layers on the corresponding metal sheets as oxygen evolution electrodes ( Fig.…”

Section: Electrocatalytic Oermentioning

confidence: 99%

“…Taking boronized Ni sheet as an example, our group found that the amorphous, ultrathin layers (2-5 nm) were generated on the electrode surface after the OER. 44,45 Metaborate was demonstrated to be the stable boron species in the surface oxidized layers, while the electrode surface was oxidized and transformed into γ-NiOOH during the catalysis process. As a result, metaboratecontaining oxyhydroxide films formed in situ on the boride surfaces were identified as the catalytic phase with high OER activity.…”

Section: Electrocatalytic Oermentioning

confidence: 99%

See 3 more Smart Citations

Intermetallic borides: structures, synthesis and applications in electrocatalysis

Chen

Zou

2020

Inorg. Chem. Front.

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120

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Section: Element Reaction Routementioning

confidence: 94%

Section: Electronic and Bonding Propertiesmentioning

confidence: 99%

Section: Electrocatalytic Oermentioning

confidence: 99%

Section: Electrocatalytic Oermentioning

confidence: 99%

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Intermetallic borides: structures, synthesis and applications in electrocatalysis

Chen

Zou

2020

Inorg. Chem. Front.

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120

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“…[46][47][48][49] Zou and co-workers have fabricated nickelb oride layers on nickel plates at 800 8Ct hrough the gas-solid reactiono rs olid boronization process by using a nickel substrate and amorphous boron powder as the raw materials.T he as-prepared electrochemically activated, boronized nickel plate exhibits an early ten-fold increasei nc atalytic activity compared with the nickel plate, and showsr emarkable catalytic stability. [50] Similarly,W ang and co-workers have also prepared aF eNi@FeNiB materialw ith al ower synthesis temperature (700 8C). They found that the generated metal borideso n aF eNi foam possessed complexity and diversity.M ore crystalline metal borides were formed on increasing the synthetic temperature up to 600 and 700 8C, whereas the nanocrystallinity of metal boridesd ecreased with the temperature rising further to 800 and 900 8C.…”

Section: Synthesis Of Transition Metal Boridesmentioning

confidence: 99%

Electrocatalysts Based on Transition Metal Borides and Borates for the Oxygen Evolution Reaction

Cui

Zhang

Zheng

et al. 2020

Chemistry A European J

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Electrochemical water splitting is a clean and sustainable process for hydrogen production on a large scale as the electrical power required can be obtained from various renewable energy resources. The key challenge in electrochemical water splitting process is to develop low‐cost electrocatalysts with high catalytic activity for the hydrogen evolution reaction (HER) on the cathode and the oxygen evolution reaction (OER) on the anode. OER is the most important half‐reaction involved in water splitting, which has been extensively studied since the last century and a large amount of electrocatalysts including noble and non‐noble metal‐based materials have been developed. Among them, transition metal borides and borates (TMBs)‐based compounds with various structures have attracted increasing attention owing to their excellent OER performance. In recent years, many efforts have been devoted to exploring the OER mechanism of TMBs and to improving the OER activity and stability of TMBs. In this review, recent research progress made in TMBs as efficient electrocatalysts for OER is summarized. The chemical properties, synthetic methodologies, catalytic performance evaluation, and improvement strategy of TMBs as OER electrocatalysts are discussed. The electrochemistry fundamentals of OER are first introduced in brief, followed by a summary of the preparation and performance of TMBs‐based OER electrocatalysts. Finally, current challenges and future directions for TMBs‐based OER electrocatalysts are discussed.

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Gold‐Supported Gadolinium Doped CoB Amorphous Sheet: A New Benchmark Electrocatalyst for Water Oxidation with High Turnover Frequency

Haq

Mansour

Munir

et al. 2020

Adv Funct Materials

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Electrochemical water splitting has been considered a promising approach for green and sustainable hydrogen as a future energy carrier. However, the lack of high performance and inexpensive electrocatalysts for kinetically sluggish oxygen evolution reaction (OER) hinder the practical application. Here, the noteworthy enhancement of electrodeposited cobalt boride (CoB) nanosheets from the combined effect of using gadolinium as a dopant and thin film of gold as prudent support is demonstrated. The free-standing Gd-CoB@Au exhibits remarkable electrochemical performance, high intrinsic activity, and lower reaction resistance, which are confirmed by lower onset potential, small charge transfer resistance, lower Tafel slope value, and high turnover frequency. Furthermore, the post-OER characterization signpost, no observable change in the chemical structure or morphology of nanosheets during the long-lasting oxidation process. Because of the inexpensive, facile, and scalable one-step preparation processes, the catalyst is highly encouraging for large-scale practical applications.in pursuing toward viable electrochemical water splitting module. [1] The HER follows a relatively simple mechanism and various cost-effective and efficient metal/ alloy-based catalysts have been developed to produce hydrogen at fairly low overpotential. [2] A serious challenge, however, is the slow rate of multistep OER, which requires high activation energy and thus large overpotential to break OH bond, and to form an OO bond and transfer 04 electrons essentially required for oxygen evolution from two water molecules at the same time. [3] The slow rate of OER in turn adversely affects the overall rate of water splitting for hydrogen production. [4] It is, therefore, essentially required to develop stable, economical, and effective electrocatalysts for OER for the feasible production of H 2 by water splitting. Currently, IrO 2 and RuO 2 are the benchmark OER catalysts to significantly improve slow kinetics of oxygen evolution at the anode. These electrocatalysts are made up of expensive precious metals, and their supply is not sustainable and is, therefore, not much suitable for large-scale applications in water oxidation systems. [5] Besides precious metals, several costeffective nanoscale materials including layer double hydroxides, perovskite, amorphous/crystalline metal hydroxides have been extensively explored for OER. [6][7][8] Hence, it is well established, that nano-structuring is one of the widely adopted strategies to enhance the catalytic properties and selectivity, toward the OER for practical application. [9] However, low mass loading of catalyst, mechanical and chemical instability, less exposed surface area, reproducibility, potentially induced phase/electronic transformation during catalysis, surface leaching of the catalyst due to the low adhesion of catalyst are still serious concerns that need to be addressed. [10] Also, the use of powder nanomaterials traditionally needs various binders (Nafion/polymers) for the fabricati...

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In situ structural evolution of a nickel boride catalyst: synergistic geometric and electronic optimization for the oxygen evolution reaction

Abstract: A boronized nickel plate shows surface structural evolution and activity enhancement during the OER due to synergistic geometric and electronic effects, and shows good catalytic stability for over 1500 hours.

Cited by 84 publications

References 57 publications

Intermetallic borides: structures, synthesis and applications in electrocatalysis

Intermetallic borides: structures, synthesis and applications in electrocatalysis

Electrocatalysts Based on Transition Metal Borides and Borates for the Oxygen Evolution Reaction

Gold‐Supported Gadolinium Doped CoB Amorphous Sheet: A New Benchmark Electrocatalyst for Water Oxidation with High Turnover Frequency

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